When I have a knife with me in the tropics, the sweat is literally pouring off me. Even tool steels do well if I just wipe them off with a dry cloth and follow up with an oil cloth. Stainless knives do rust.
My H1 Rock Salt has sat in salt water without being rinsed after, been drenched in sweat, not cleaned for a week and still looks great. I have opened 40 or 50 coconuts with it in a day and the blade was still shaving hairs off my arm when I was finished.